Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares available for issuance under the 2011 Plan (in shares)	3,249,041
Stock options, granted (in shares)	500,388
Stock options, weighted average exercise price (in dollars per share)	$ 54.07
Stock options, weighted average grant date fair value (in dollars per share)	$ 10.18
Assumptions used in Black-Scholes model
Risk-free interest rate (in hundredths)	1.67%
Expected life (in years)	5 years 9 months 18 days
Stock volatility (in hundredths)	19.10%
Dividend yield (in hundredths)	1.00%
Granted, PVS awards (in shares)	94,222
Grant date fair value, PVS awards (in dollars per share)	$ 54.07
Number of shares of common stock per PVS award (in shares)	1
Performance period	3 years
PVS payout, Minimum (in hundredths)	0.00%
PVS payout, Maximum (in hundredths)	200.00%
Stock-based compensation expense	$ 5.3	$ 4.3